Tesoro Bandido - 18,5Khz - To find small gold nuggets

[SWL]

Andre... Probably insulting strangers is your position in life. With this motivation, you won't find friends and support here. Your project is really useless --- take criticism calmly. Nothing personal.

[Andre]

Kisses'n your heart!

[Op04]

Dear Op04,
The ICL766X causes ripples in the negative supply. So,. I don't like using it.
Thank you for message!

Your dual supply inspired me to modify other tesoro design which also using 7660 from now I can replace with 79XX. Thanks a lot !! The CA3140 is very unique chip.

I think this design should build first and compare measurement result to fair judgement

[Andre]

Your dual supply inspired me to modify other tesoro design which also using 7660 from now I can replace with 79XX. Thanks a lot !! The CA3140 is very unique chip.

I think this design should build first and compare measurement result to fair judgement

Dear Op04,

Perfect!!!! You are a good man and a fair person!

[SWL]

Op04... Don't repeat the mistakes of others - 78xx series regulators are not the best choice for this power scheme. They require a difference between the input and output voltage of 2V. When the batteries are discharged by 0.2 each, the operation of the stabilizer will be unstable and noisy. Here you need to use the LDO and make the midpoint using the opamp. In this case, it is necessary to increase the battery voltage (if required +\- 7v) or apply a step-up DC\DC module. For example, how is it done in Whites 6000

[WM6]

As they says here in Brazil: "A inveja mata, seu fdp de pau pequeno!"

You do not need pequeno for this life salving trick:

[Op04]

Op04... Don't repeat the mistakes of others - 78xx series regulators are not the best choice for this power scheme. They require a difference between the input and output voltage of 2V. When the batteries are discharged by 0.2 each, the operation of the stabilizer will be unstable and noisy. Here you need to use the LDO and make the midpoint using the opamp. In this case, it is necessary to increase the battery voltage (if required +\- 7v) or apply a step-up DC\DC module. For example, how is it done in Whites 6000

Thank you SWL for pointing that out, so the battery voltage must be higher If I want to choose 78/79 or LDO even LM317/337 maybe filtering caps 4700-6800uf needed. Dual supply remind me of elector '81 design, though I didn't successful make it deep, Andre just showing his project done with 78/79 supply and I would like to use it for other tesoro design, he just put an example it will work with old fashion dual supply

[bgs]

Are there integral low dropout regulators ... the Magnum regulator is also low dropout .